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Prepaid Expenses and Other Current Assets, and Other Assets (Details) (USD $)
 3 Months Ended 3 Months Ended
Mar. 29, 2014
Dec. 28, 2013
Sep. 27, 2014
Subsequent event
Prepaid expenses and other current assets      
Term loans to employees $ 1,764,000 $ 1,764,000  
Other 7,914,000 10,001,000  
Total 9,678,000 11,775,000  
Other assets      
Forgivable loans to employees and non-employee experts 52,613,000 51,083,000  
Other 3,217,000 3,538,000  
Total 55,830,000 54,621,000  
Prepaid expenses and other assets disclosures      
Term of forgivable loans or advances to employees and non-employee experts, minimum 3 years    
Term of forgivable loans or advances to employees and non-employee experts, maximum 8 years    
Forgivable loans issuable to employees, future employees and non-employee experts for future service 4,300,000 4,966,000  
Prepaid Expenses and Other Current Assets, and Other Assets      
Forgivable loans issued to future employees for future service $ 5,000,000   $ 4,300,000